| 摘要 |
<p>PURPOSE:To ensure antifreezing operation without lowering temperature in a hot water storage tank in a hot water storage type hot water supplier. CONSTITUTION:There are provided a hot water storage tank 1, a water pump 2, a heat source 3, a piping 4 for constructing a water circulation circuit by connecting the former members in series, a first water temperature detector means 5 for detecting water temperature heated by the heat source 3, and a second water temperature detector means 6 for detecting water temperature on the upstream side of the heat source 3. There is further provided an antifreezing operation controller 7 for operating the water pump 2 with a minimum flow rate when the water temperature on the upstream side of the heat source 3 in the course of interruption of boiling operation is antifreezing operation initiation temperature or lower and simultaneously operating the heat source 3 with a maximum capability and for interrupting the operation of the heat source 3 and the water pump 2 when water temperature detected by the first water temperature detector means 5 is antifreezing operation completion temperature or higher. Accordingly, antifreezing operation is effected such that hot water to the hot water storage tank 1 gets high temperature in a short time. Thus, hot water is stored at the upper portion in the hot water storage tank 1 and hence any stirring is eliminated and temperature of boiled hot water is not lowered.</p> |
